Parking Brake System: Adjustments

WM 468315 Adjusting the foot-operated parking brake

Tools






Checking

Foot-operated parking brake: Checking free play

The foot-operated parking brake, hereafter referred to as the FPB, is equipped with asbestos-free brake pads. The FPB pedal module is located on the left in the driver's footwell.
1. Lift vehicle => 40 Lifting the vehicle.

Information

- An FPB that is equipped with asbestos-free brake pads must never be adjusted in such a way that the pad has to grind free during operation.

- Adjustments must only be carried out at the two rear wheel adjustment devices. No adjustment may be made on the pedal module or on the Z deflector on the centre console.

- Ensure that the FPB cables are routed correctly.

Check free play at the pedal module:

To do this, measure from the left seat rail up to the lower edge of the pedal plate of the FPB.
2. Depress pedal 40 mm (+ 5 mm). When this dimension is reached, the wheels must be able to turn without grinding the brake pads.
3. Depress pedal 75 mm (+ 5 mm). When this dimension is reached, the wheels must be fixed. If the wheels can still turn, the FPB must be adjusted.

Adjusting

Adjusting the foot-operated parking brake

The rear wheels must be removed to gain access to the adjustment device => 440519 Removing and installing wheel - section on "Removing".

In the event of unfavourable tolerances, the brake pads may prevent the brake disc from turning freely. If this happens, the brake pads must be (evenly) pressed back a little with the piston resetting fixture (replaces P83) NR.144 , refer to Tools and Equipment -direction arrow- .





1. Release the FPB pedal so that the wheels and brake discs can turn freely.

The wheels may still grind slightly even then. If this happens, loosen the rear brake cables by moving them to and fro gently.
2. Remove rear wheels => 440519 Removing and installing wheel - section on "Removing".
3. Adjust brake shoes (on both wheels). To do this, unscrew the plug -arrow- and turn the brake disc with the opening towards the adjustment device position. Using a screwdriver, adjust the adjustment device until the wheel can no longer be turned. Then unscrew by 6 teeth (wheels must be free to turn).





4. Check the free play on the pedal module once again.
5. Position disc brake pads by operating the brake several times.
6. Fit rear wheels => 440519 Removing and installing wheel - section on "Installing".